Cream of Tartar

So, I want to make some Snickerdoodles for the first time(first cookies ever actually) and it seems like Cream of Tartar is like, the most important ingredient. Problem is, I don’t have any. And it’s also Christmas so all the stores are closed.

I saw a video saying Lemon juice may be a substitute but I’m not sure as I’ve never even heard of Cream of Tartar lol.

Merry Christmas to those who celebrate aswell 🎄